Hasegawa's right hook is solid... It has been one of the best punches in boxing. Personally, I prefer Bute and Rigondeaux's counter left uppercuts to the body, Montiel's lead left hook, Mayweather's lead right cross, Kirkland's lead left cross to the body, and Donaire's counter left hook.

ALL solid punches but all of them also usually take several shots to drop people, aside from Donaire's, which I've already mentioned.

Hasegawa's right hook is the finish line for fights. It's power is to the point that it is the ONLY punch he can end the fight with.

The rest of that list, outside from Mayweather, who used to employ the left hook to get people out of there, are people known for having a powerful punch period.